M2 stylus with 0.5 mm diameter ruby ball, tapered carbide stem, and 3.0 mm diameter x 6.0 mm long stainless steel base. Minor stem diameter is 0.4 mm, major diameter is 1.0 mm. Stylus length is 10.0 mm to ball center. Stylus weight is 0.22 gram. Compare to Renishaw A-5000-7805 and Zeiss 623062-3132-000.